[cfe-dev] libclang: Merge multiple platform availability declarations

[Ronald Wampler via cfe-dev]

Hi,

I’m working on a tool to list all deprecated APIs on macOS and using libclang's `clang_getCursorPlatformAvailability`. On macOS 10.12, the APIs are marked (to best of my knowledge) deprecated using the following  macro __OSX_DEPRECATED(_start, _dep, _msg) 

Which is defined as

__OSX_AVAILABLE(_start) __OS_AVAILABILITY_MSG(macosx,deprecated=_dep,_msg)

These macros expand to something like 

__attribute__((availability(macosx,introduced=_start))) __attribute__((availability(macosx,deprecated=_dep,message=_msg)))

This appears to cause `clang_getCursorPlatformAvailability` to populate the array with two separate CXPlatformAvailability instances. Would it not be desirable to merge these two declarations as if it was defined as just  __attribute__((availability(macosx,introduced=_start,deprecated=_dep,message=_msg)))?

Thank you,

Ron